Conveyer for furnaces



R. S. COCHRAN CONVEYER FOR FURNACES March 7, 1933.

, 1931 2 Sheets-Sheet l Filed March 2l RHLF C0 CHR/1N HTTORNE Y.

.nlllmmlwmA March 7, 1933. R. s CQCHRAN LQOAZS CONVEYER FOR FURNACE S Filed March 2l, 1951 2 Sheets-Shea?I 2 /fvs/ENTOR: HHLF 5. Coe/imm Patented ,Main 7, 1933 y UNITED STATES PATENToFFIcE RALF S. COCHRAN, OF'TOLEDOAfO'HIO, AVSSIGNOR TO SURFACE COM'BUSTION' CORPORAIIION',y

' OF TOLEDO, OHIO,-

CORPORATION OF NEW YORK coNvEYER 'non summons I Afpiieatio flied March 21, 193i. seri'ai ivo. 524,299.

This invention relates to conveyers for moving material through a heat treating furnace and more particularly to a conveyer iny cluding a reciprocating memberhaving trip 5 dogs adapted to engage the work in one direc'tion of movement of the reciprocating member.

The invention has among its objects to provide for' they trip Vdogs a type of bearing or mounting which regardless of the adverse conditions of use will'al-ways permit the dogs to function in their intended manner; `and in" general toy provide a conveyer which shall besimpl'ein construction and reliable in operation. Y

Referring to the drawings `wherein the preferred form ofthe invention is shown: f

Fig. 1 is a longitudinal section through a furnace showing the improved conveyer associated therewith;

Fig. 2 is a section on line 2 2 of Fig. 6;

Fig. 3 "is a section on line 3 3 of Fig. 2; Fig. t'is a section on line 1- 4 of Fig. 2, the pedestal being omitted;

Fig. 5 is a section on line 5 5 of Fig. 2, the pedestal being omitted;

f Fig.Y 6 is a section on line 6 6 of Fig. 1;

. Fig. 7 is a section on line 7 7 of Fig. 6;

Fig. 8 is a perspective viewv of kone of the work-supporting rails; and

Fig.f9 illustrates a modified form of bearing for the gravity dog.

This invention finds special utility in connection with furnaces of a width to permit relatively long objects such as bars or pipes to be passed therethrough crosswise thereof. The furnace itself may be of any preferred construction and may be fired in anypreferred manner. The furnace shown in the drawings'is provided with three consecutive ring chambers A, B and C of which A is the rst or mainY heating chamber fired by opposed burners `10 and 10'; burners 10"' and -10`fo`r`the other chambers being ofthe same type as the burners for .chamber A. Burners 10d and 10e are lalso shownat opposite ends of the V,furnace below the conveyer. -The work tobe heat treated is shown as pipe W.

Theywork is advanced through the furnace on a bed of fixed rails 11 which-extend longitudinally of the'furnace in laterally spaced relation. The `work is advanced along said rails by `a series of reciprocating members 12 arranged alongsideI said rails, said mem'- bers being provided with a series of trip dogs 13 which-arenormally held by gravity gin an upright position for engaging thework on forward movementY of` the reciprocating member. The work tobe heat-treated is brought to the front end ofthe furnace in any suitable manner as by rolls 14. and after being heat-treated isV received onways 15 which lead to conveyerrolls 16 as will be readily understood.

The rails 11 are made up of sections of convenient or suitable length, the adjacentends of the sectionsbeing coupled by apin and vslot connection, of which the pin is indicated 'at 17 and the slotat 18, whereby to vprovide expansiongjoints. Said pins extend through upright anges 19 formed on individual ped- V estals 2O which are anchoredvto and which rise from the-floor 21-of the furnace.V Masonry piers 22 extendV between the pedestals 20, the

rails 11 resting on the piers, the rails being providedvwith depending side iianges 23 disposed on opposite sides of the piers whereby to prevent relative lateral movement between f the rails and piers. In order to prevent round work from freely rolling along the rails the latter may be provided with a-seriesof inclines or serrations 24 wherein the work tends Vto rest until positively pushed therefrom by said dogs 13.

The reciprocating members 12 are reciprocated in unison 4by any suitable mechanism generally indicated at25. For illustrative purpose said mechanism kis shown as comprising a rack and pinion arrangement ofA which the racks are indicated at 26 and the' pinions at 27, the pinions being mounted on a common driving shaft 28 driven by any suitable prime mover 29. The racks are shown as individual elements hinged to the end of their respective members 12, the racks being confined in suitable guide ways 30.

The reciprocating members 12 are made up of sections of convenient length rigidly connected together by any suitable means 31. Said members are supported by the. aforementioned pedestals in a channel 32 provided for that purpose. Individually said members preferably comprise a pair of channel-type beams rigidly connected bya series of cross pieces 33 and 34 which also serve va purpose hereinafter set forth.

The manner of mounting theptrip dogs 1,3 constitutes the important feature of the present invention and will now be described. VThe dogs have a pivotal bearing intermediate Y their ends, the lower end being weighted as at 35 whereby the dog will-normally assume the position shown in Fig. 4, and when passing under the work will assume the position shown in Fig. 5. The pivotal connection for the dogs is of the line or knife-edge type. In the preferred form as shown in Figs. 2, 4 and 5, the dog itself provides the anvil for the bearing whereas in the modified form of the invention, the-side members comprisingr the rail `12 are formed to provide the anvil.

Referring rst to the form of the invention shown in Figs. 2, 4'and 5: The dog is provided with an opening wherethrough extends a bearing pin 40 non-rotatably secured in the sides of the rail 12 in any approved manner. The pin intermediate its ends is shaped to provide upwardly converging sides the apex of which constitute the line or knife-edge bearing. The anvil part of the bearing is indicated at 41 the same being formed as an inwardly projecting portion ofthe hub 42 of the dog. It will be noted that the dog eX- tends between the cross pieces 33 and 34 and is provided with shoulders 37 and 38 for engagement therewith, the cross pieces serving as abutments for effectively locking the dog Vagainst turning when it is pushing the work as will be readily understood.

While it is preferred to have the dog abut the cross piece 33 as well as the cross piece '34, nevertheless it is within the spiritof the invention to omit the abutment 33. In the absence of the abutment 33, the underside of the pin 40 serves as an abutment against the rail`12 are anvils 41.

'edge bearing comprising a pin securedto said mal position of the dog instead of being in the vertical is disposed at a forward incline to the vertical as in Fig. 4, and more especially where the work engaging surface of the dog is across the end of the dog. In such case the major portion of the thrust of the work is taken by the abutment 33 as will be readily appreciated by reference to Fig. 4.

In the modified form of the invention shown in Fig. 9, the bearing pin 40 is nonrotatably secured to the dog 13 the ends of the pin being'shaped to provide converging walls the apex of which is at the forward side of the pin instead ,of at the upper side thereof as in Fig. 4. Formed in the sides of A lower cross piece 34 cooperates with the pin 40 to lock the dog against turning when the dog is pushing the work,'it being noted that the dog is normally in the vertical and is adaptedto engageV the work W from behind in a direct pushing contact. The backward thrust by the work against the dog is taken not by the Aanvils 41 but by the back 42a of the pin in member, a trip dog carried by said member for engaging thework, a knife-edge bearing for rotatably supportingsaid dog, and means independent of said bearing for taking the thrust of the work against the dog, said knifemember and an anvil on said dog overlying said pin. y

2. In apparatus for pushing work along a support, the combination of a reciprocable member, a trip dog carried by said member for engaging the work,l a vknife-edge bearing for rotatably supporting said dog, and means independent of said bearing for taking the thrust of the work against the dog, said member comprising a pair` of similar elements tied together by means including upper and lower cross pieces, the dog having its knifeedge bearing between said pieces.

3. In apparatus for pushing work along a support, the combination of a reciprocable. member, a trip dog carried by said member for engaging the work, the upper end of the dog being adapted to engage the work, said end having a backward incline, a pair of abutments `between which the dog extends and l.

which hold the dog against rotation in one direction, a pivot pin for the dog, said pin being disposedbetween said abutments, and a shoulder on the dog adapted to engage the upper surface of the upper of said abutments.

4. A conveyer for moving material through a heat treating furnace along a support, comprising a reciprocable member, a trip dog carried by said member having its upper end adapted for engaging the work and having a plow on its lower forward end, a line bearing for rotatably supporting said dog and a channel mounting for the reciprocating member, said channel having a depressed central portion wherein the plow end of the dog is reeiprocable.

In testimony whereof I aiiX my signature.

RALF S. COCHRAN. 

